Tektronix Tektronix SPG8000 User manual

SPG8000

Master Sync / Clock Reference Generator

ZZZ

Service Manual

xx

www.tektronix.com

*

P077074901*

077-0749-01

or suppliers, and are protected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication

supersedes that in all previously published material. Speciﬁcations and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc.

14150 SW Karl Braun Drive

P.O. Box 500

Beaverto

n, OR 97077

USA

For product information, sales, service, and technical support:

In North America, call 1-800-833-9200.

Worldwide, visit www.tektronix.com to ﬁnd contacts in your area.

Warranty

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1)

year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its

option, either will repair the defective product without charge for parts and labor, or will provide a replacement

in exchange for the defective product. Parts, modules and replacement products used by Tektronix for warranty

work may be n

ew or reconditioned to like new performance. All replaced parts, modules and products become

the property of Tektronix.

In order to o

btain service under this warranty, Customer must notify Tektronix of the defect before the expiration of

the warranty period and make suitable a rrangements for the performance of service. Customer shall be responsible

for packaging and shipping the defective product to the service center designated by Tektronix, with shipping

charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within

the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping

charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate

maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage

result

ing from attempts by personnel other than Tektronix representatives to install, repair or service the product;

b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any damage

or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been modiﬁed or

integrated with other products when the effect of such modiﬁcation or integration increases the time or difﬁculty

of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY

OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY

IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

TEK

TRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE

AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.

TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL,

OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS

ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

[W2 – 15AUG04]

Table of Contents

Important safety information ..................................................................................... iv

General safety summary ..................................................................................... iv

Service safety summary...................................................................................... vi

Terms in thi

s manual ........................................................................................ vii

Symbols and terms on the product......................................................................... vii

Preface .............................................................................................................. ix

Manual structure .............................................................................................. ix

Manual conventions ........................................................................................... x

Product documentation....................................................................................... xi

Theory o

f operation ................................................................................................ 1

Base instrument theory of operation......................................................................... 1

Optional modules theory of operation....................................................................... 4

Adjustment procedures............................................................................................ 13

Adjust master clock using a frequency signal generator ................................................. 13

Adjust master clock while locked to GPS or GLONASS ................................................ 16

Adju

st Option BG............................................................................................. 18

Adjust Genlock/Black board ................................................................................ 24

Adjust Option SDI............................................................................................ 26

Maintenance........................................................................................................ 33

General service information ................................................................................. 33

Inspection and cleaning ...................................................................................... 36

Re

move and replace procedures ............................................................................ 39

Troubleshooting............................................................................................... 65

Repackaging instructions .................................................................................. 105

Replaceable parts ................................................................................................ 107

Parts ordering information................................................................................. 107

Replaceable parts lists...................................................................................... 109

SPG8000 Master Sync / Clock Reference Generator Service Manual i

Table of Contents

List of Figure

s

Figure 1: SPG8000 block diagram ............................................................................... 2

Figure 2: Simpliﬁed block diagram of the Option AG ........................................................ 4

Figure 3: Simpliﬁed block diagram of the Option BG ........................................................ 5

Figure 4: Simpliﬁed block diagram of the Genlock/Black and Option GPS circuitry...................... 7

Figure 5: Simpliﬁed block diagram of Option SDI ............................................................ 9

Figure 6: Adjusting the mas

ter clock frequency using a frequency standard............................... 14

Figure 7: Variable resistors on the Option BG board.......................................................... 19

Figure 8: Adjusting the Option BG output offset and gain ................................................... 19

Figure 9: Adjusting chroma gain ................................................................................ 22

Figure 10: Triggered display for adjusting the Option BG chroma gain .................................... 23

Figure 11: Equipment connections for Genlock/Black adjustments ......................................... 24

Figure 12: Instrument orientation................................................................................ 40

Figure 13: Module locator diagram ............................................................................. 41

Figure 14: Cable connections 1 of 3............................................................................. 42

Figure 15: Cable connections 2 of 3............................................................................. 43

Figure 16: Cable connections 3 of 3............................................................................. 44

Figure 17: Removing the top cover ............................................................................. 46

Figure 18: Removing the front panel assembly ................................................................ 49

Figure 19: Disassembling the front panel assembly ........................................................... 50

Figure 20: Removing the power supply......................................................................... 53

Figure 21: Removing the Power Combiner board ............................................................. 54

Figure 22: Main board (view from top)......................................................................... 72

Figure 23: Option AG troubleshooting procedure ............................................................. 74

Figure 24: Option BG troubleshooting procedure ............................................................. 76

Figure 25: Genlock/Black generator module power supply test ............................................. 81

Figure 26: Genlock/Black generator board voltage test point and fuse locations .......................... 83

Figure 27: SDI power supply test points...................................................................... 102

Figure 28: Main instrument exploded view .................................................................. 109

Figure 29: Chassis assembly exploded view ................................................................. 111

Figure 30: Front panel assembly exploded view............................................................. 113

Figure 31: Option AG exploded view......................................................................... 115

Figure 32: Option BG exploded view......................................................................... 116

Figure 33: Genlock/Black generator board and Option GPS Receiver board exploded view .......... 118

Figure 34: Option SDI board and Option SDI Output board exploded view ............................. 120

ii SPG8000 Master Sync / Clock Reference Generator Service Manual

Table of Contents

List of Tables

Table i: Product documentation.................................................................................. xi

Table 1: Equipment required to adjust the master clock using a signal generator.......................... 14

Table 2: Equipment required to adjust the m aster clock while locked to GPS or GLONASS............ 16

Table 3: Adjusting Option BG ................................................................................... 18

Table 4: Equipment required for the Genlock/Black board adjustment procedures........................ 24

Table 5: Equipment required for the Option SDI adjustment procedures ................................... 26

Table 6 : SDI output amplitude ........... .............. .............. ............................................ 27

Table 7 : External inspection checkli

st........................................................................... 37

Table 8: Internal inspection checklist ........................................................................... 37

Table 9: Required tools for removal and replacement of modules........................................... 40

Table 10: Cable connections table 1 of 3 ....................................................................... 42

Table 11: Cable connections table 2 of 3 ....................................................................... 43

Table 12: Cable connections table 3 of 3 ....................................................................... 44

Table 13: Slot I/O test error codes............................................................................... 68

Table 14: SPG8000 system diagnostics......................................................................... 69

Table 15: SPG8000 troubleshooting procedures............................................................... 71

Table 16: Equipment required to troubleshoot the Option AG ............................................... 73

Table 17: Equipment required for Option BG troubleshooting............................................... 75

Table 18: Equipment required for troubleshooting the Genlock/Black generator module ................ 77

Table 19: General problems – Genlock/Black board .......................................................... 78

Table 20: POST error codes for the Genlock/Black module.................................................. 79

Table 21: Power supply test points .............................................................................. 82

Table 22: Equipment required for troubleshooting the Option GPS module ............................... 87

Table 23: General problems – Option GPS..................................................................... 88

Table 24: POST error code for Option GPS.................................................................... 89

Table 25: Equipment required to troubleshoot the Option SDI .............................................. 93

Table 26: Option SD

I troubleshooting .......................................................................... 94

Table 27: POST error codes for Option SDI ................................................................... 95

Table 28: Option SDI module factory default settings ........................................................ 98

Table 29: Parts list column descriptions ...................................................................... 108

Table 30: Main instrument replaceable parts ................................................................. 109

Table 31: Chassis assembly replaceable parts................................................................ 110

Table 32: Front panel assembly replaceable parts ........................................................... 112

Table 33: Option AG – replaceable parts ..................................................................... 114

Table 34: Option BG – replaceable parts ..................................................................... 116

Table 35: Genlock/Black board and Option GPS Receiver board – replaceable parts................... 117

Table 36: Option SDI – replaceable parts..................................................................... 119

Table 37: Standard and optional accessories for the SPG8000............................................. 121

SPG8000 Master Sync / Clock Reference Generator Service Manual iii

Important safety information

Important saf

ety information

This manual c

ontains information and warnings that must be followed by the user

for safe operation and to keep the product in a safe condition.

To safely pe

rform service on this product, additional information is provided at

the end of this section. (See page vi, Servicesafetysummary.)

General safety summary

Use the product only as speciﬁed. Review the following safety precautions to

avoid injury and prevent damage to this product or any products connected to it.

Carefully read all instructions. Retain these instructions for future reference.

Comply with local and national safety codes.

For correct and safe operation of the product, it is essential that you follow

generally accepted safety procedures in addition to the safety precautions speciﬁed

in this manual.

The product is designed to be used b y trained personnel only.

Only qualiﬁed personnel who are aware of the hazards involved should remove

the cover for repair, maintenance, or adjustment.

Before use, always check the product with a known source to be sure it is

operating correctly.

This product is not intended for detection of hazardous voltages.

Whi

le using this product, you may need to access other parts of a larger system.

Read the safety sections of the other component manuals for warnings and

cautions related to operating the system.

When incorporating this equipment into a system, the safety of that system is the

responsibility of the assembler of the system.

iv SPG8000 Master Sync / Clock Reference Generator Service Manual

Important safety information

To avoid ﬁre or

personal

injury

Use proper powe

r cord. Use only the power cord speciﬁed for this product and

certiﬁed for the country of use.

Ground the product. This product is grounded through the grounding conductor

of the power cord. To avoid electric shock, the grounding conductor must be

connected to earth ground. Before making connections to the input or output

terminals of the product, make sure that the product is properly grounded.

Do not disable the power cord grounding connection.

Power disconnect. The power cord disconnects the product from the power

source. See instructions for the location. Do not position the equipment so that

it is difﬁcult to operate the power cord; it must remain accessible to the user at

all times to allow for quick disconnection if needed.

Observe all terminal ratings. To avoid ﬁre or shock hazard, observe all ratings

and markings on the product. Consult the product manual for further ratings

information before making connections to the product.

Do not apply a potential to any terminal, including the common terminal, that

exceeds the maximum rating of that terminal.

Do not operate without covers. Do not o perate this product with covers or panels

removed, or with the case open. Hazardous voltage exposure is possible.

Avoid exposed circuitry. Do not touch exposed connections and components

when power is present.

Do not operate with suspected failures. If you suspect that there is damage to this

product, have it inspected by qualiﬁed service personnel.

Disable the product if it is damaged. Do not u

se the product if it is damaged

or operates incorrectly. If in doubt about safety of the product, turn it off and

disconnect the power cord. Clearly mark the product to prevent its further

operation.

Before use, inspect voltage probes, test leads, and accessories for mechanical

damage and replace when damaged. Do not use probes or test leads if they are

damaged, if there is exposed metal, or if a wear indicator shows.

Examine the exterior of the product before you use it. Look for cracks or missing

pieces.

Use only speciﬁed replacement parts.

Do not operate in wet/damp conditions. Be aware that condensation may occur if

a unit is moved from a cold to a warm environment.

Do not operate in an explosive atmosphere.

Keep product surfaces clean and dry. Remove the input signals b efore you clean

the product.

SPG8000 Master Sync / Clock Reference Generator Service Manual v

Important safety information

Provide proper

ventilation. Refer to the installation instructions in the manual for

details on installing the product so it has proper ventilation.

Slots a nd open

ings are provided for ventilation and should never be covered or

otherwise obstructed. Do not push objects into any of the openings.

Provide a safe working environment. Always place the product in a location

convenient for viewing the display and indicators.

Be sure your work a rea meets applicable ergonomic st andards. Consult with an

ergonomics professional to avoid stress injuries.

Use only the Tektronix rackmount hardware speciﬁed for this product.

Servicesafetysummary

The Service safety summary section contains additional information required to

safely perform service on the product. Only qualiﬁed personnel should perform

service procedures. Read this Se rvice safety summary and the General safety

summar

y before performing any service procedures.

To avoid electric shock. Do not touch exposed connections.

Do not service alone. Do not perform internal service or adjustments of this

product unless another person capable of rendering ﬁrst aid and resuscitation is

pres

ent.

Disconnect power. To avoid electric shock, switch off the product power and

disconnect the power cord from the mains power before removing any covers or

panels, or opening the case for servicing.

Us

e care when servicing with power on. Dangerous voltages or currents may exist

in this product. Disconnect power, remove battery (if applicable), and d isconnect

test leads before removing protective panels, soldering, or replacing components.

Verify safety after repair. Always recheck ground continuity and mains dielectric

strength after performing a repair.

vi SPG8000 Master Sync / Clock Reference Generator Service Manual

Important safety information

Terms in this manual

These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result

in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in

damage to this product or other property.

Symbols and terms on the product

These ter

ms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read

the mark

ing.

WARNING indicates an injury hazard not immediately accessible as you

read th

emarking.

CAUTION indicates a hazard to property including the product.

When this symbol is marked on the pr oduct, be sure to consult the manual to

ﬁnd out the nature of the potential hazards and any actions that must be taken

to avoid them. (This symbol may also be used to refer the user to ratings in

the manual.)

The following symbol(s) may appear on the product:

SPG8000 Master Sync / Clock Reference Generator Service Manual vii

Important safety information

viii SPG8000 Master Sync / Clock Reference Generator Service Manual

Preface

This manual contains information needed to service an SPG8000 Master Sync /

Clock Reference Generator to the module level.

If the instrument does not function properly, troubleshooting and corrective

measures should be taken immediately to prevent additional problems.

NOTE. Conta

ct your local Tek tronix representative for information on where to

return your instrument if it requires repair during the warranty period.

To preven

t personal injury or damage to the SPG8000, consider the following

before beginning service:

The proc

edures in this manual should be performed only by a qualiﬁed service

person.

Read th

e General safety summary. (Seepageiv.)

Read the Service safety summary. (Seepagevi.)

When using this m anual for servicing, be sure to follow all warnings, cautions,

and notes.

Manual structure

This manual is divided into the following sections:

Theory of operation contains circuit descriptions that support service to the

module level.

Adjustment procedures contains procedures for adjusting an SPG8000

generator to meet warranted characteristics.

Maintenance contains information and procedures for performing preventive

and corrective maintenance for the SPG8000 generator. These instructions

i

nclude cleaning and fault isolation to the module level.

Remove and replace procedures contains procedures to safely remove

replaceable modules from the instrument.

Troubleshooting procedures contains information and procedures to help

you isolate and ﬁx various problems.

Replaceable parts includes a table of all replaceable modules, their

descriptions, and their Tektronix part numbers.

SPG8000 Master Sync / Clock Reference Generator Service Manual ix

Preface

Manual conventions

This manual uses certain conventions with which you should become familiar.

Some sections of the manual contain procedures for you to perform. To keep those

instructions clear and consistent, this manual uses the following conventions:

Names of front panel controls and menus appear in the same case (initial

capitals, all uppercase, etc.) in the manual as is used on the SPG8000 front

panel and menus.

Instruction steps are numbered unless there is only one step.

Bold text refers to speciﬁc interface elements that you are instructed to select,

click, or clear.

Example: Press the ENTER button to access the PRESET submenu.

Italic t

ext refers to document names or sections. Italics are also used in

NOTES, CAUTIONS, and WARNINGS.

Exampl

e: The Theory of operation section includes a block diagram.

Modules

Throughout this manual, the term module appears. A module is composed of

electrical and mechanical assemblies, circuit cards, and interconnecting cables.

Safe

ty

Symbols and terms related to safety appear in the General safety summary.

x SPG8000 Master Sync / Clock Reference Generator Service Manual

Preface

Product documentation

The following table lists the user documents for the SPG8000 generator:

Ta ble i: Product documentation

Availability

Document Tektronix Part Number Description Print Web CD

Quick Start User Manual 071-3080-xx (English)

077-0745-xx (Japanese)

077-0746-xx (Russian)

Describes how to install the

instrument and provides basic

operating information

Technical Reference

077-0747-xx Provides detailed operating

information

Speciﬁcations and

Performance Veriﬁcation

077-0748-xx

Lists the product speciﬁcations and

provides procedures for verifying

the performance of the instrument

Service Manual

077-0749-xx Describes how to service the

instrument to the module level

(such as circuit boards and fuses)

Declassiﬁcation and

Security Instructions

077-0750-xx Describes how to clear or sanitize

the data storage (memory) devices

in the product for customers with

data security concerns.

Release Notes 077-0751-xx

Describes the new features,

improvements, and limitations of

the instrument ﬁrm ware

Video Sync Pulse

Generator and Electronic

Changeover Unit System

Integration Technical

Reference

077-0563-xx

(ECO422D)

077-0877-xx

(ECO8000, ECO8020)

Provides information for system

integrators who are designing

systems for high-deﬁnition (HD)

and standard-deﬁnition (SD) digital

video content where Tektronix

electronic changeover units and

video sync pulse generators are to

be deployed.

SPG8000 Master Sync / Clock Reference Generator Service Manual xi

Preface

xii SPG8000 Master Sync / Clock Reference Generator Service Manual

Theory of operation

Base instrume

nt theory of operation

This section describes the basic operation of the major circuit blocks or modules

in the SPG8000 generator. The block diagram shows the modules and functional

blocks in th

e instrument. (See Figure 1.)

Information about the circuit blocks, including a detailed block diagram of the

Genlock/B

lack board, follows the SPG8000 block diagram.

Main board

The Main board consists of the following seven blocks.

Process

or core. The processor core consists of the C PU and all of its support

circuits such as ﬂash memory, DDR memory, clocks, buffers, reset circuit,

conﬁguration memory, and decoder PLD.

The CPU controls the front panel, LCD display, USB port, network interface,

GPI interface, and installed generator boards. The CPU also controls execution

of remote commands and downloading and uploading of signal ﬁles through

the Ethernet interface.

The ﬂash memory holds the ﬁrmware data and signal data used to generate

outputs from some modules. During Genlock, GPS or GLONASS referenced

operation, the CPU reads data from the input module, and controls the frequency

of t

he secondary clocks.

Ovenized oscillator. The ovenized o scillator provides the stable time base for

generating signals. This is a ﬁxed 20 MHz and is not adjustable.

Video / audio clocks. The synthesizer creates the video and audio clocks from the

o

ven output. The video clocks are a 54 MHz master clock signal and HD rate

clocks of 74.25 MHz and a 74.25/1.001 MHz. The audio clock is 12.288 MHz.

The CPU can control the ratio between the oven and these clocks. B y controlling

this ratio, the system can lock to external s ignals for Genlock, GPS or GLONASS

reference. The ratio is also adjusted to achieve calibration, with the resulting

value stored in ﬂash memory.

The 54 MHz and the 12.288 MHz are delivered to each generator card. For the

HD rate clocks, the CPU controls four m ultiplexers that independently allow

each generator card to get either the 74.25 MHz or 74.25/1.001 MHz clock. The

diagnostics monitor that each clock is correctly locked to the oven or master

54 MHz clock.

Frame pulse generator. The frame pulse generator uses the 54 MHz clock to

generate the three frame pulses at 2.997 Hz, 6.25 Hz, and 3.00 Hz that are used to

synchronize the signal formats generated by the installed options.

SPG8000 Master Sync / Clock Reference Generator Service Manual 1

Theory of operation

Fig

ure 1: SPG8000 block diagram

2 SPG8000 Master Sync / Clock Reference Generator Service Manual

Theory of operation

DC/DC converte

rs. This block converts the +5 V supplied by the Power Combiner

board to –5 V, 3.3 V, 8 V, and 5 V analog for use by the circuit boards. Various

voltages needed only on the Main board, such as to drive the DDR and processor

core, are also provided.

The high current 5 V and 3.3 V voltages supplied to the slots are fused at the

connector to each generator board. All of the major voltages, including both sides

of each fuse, are monitored by the voltage diagnostic.

Network in

terface. This block controls the Ethernet interface.

The Ethernet port is located on the Breakout board at the instrument rear panel.

GPI interface. The GPI interface allows the CPU block to access the user inputs

and outputs through the GPI ports located on the instrument rear panel.

There are two GPI circuit blocks, GPI 1 and GPI 2. GPI 1 is located on the Main

board. GPI 2 is located on the Genlock/Black board. Both sets of GPI signals

route through the cable to the Breakout board. The Breakout board houses the

rear panel GPI, GPI/LTC, and Ethernet connections. The signals from GPI 1

are connected to pins 6,7,8 and 9 o f the 9-pin rear panel GPI connector. The

signa

lsfromGPI2areavailableonpins2,3,4and5ofthe9-pinrearpanelGPI

connector, and on pins 1,2,3 and 11 of the 15-pin rear panel G PI/LTC connector.

All of the GPI connections are available on the GPI port, but only the ones from

block GPI 2 are on the GPI/LTC port.

Power supply

The SPG8000 has a redundant power subsystem, which contains three major

components: the two power supply modules and the Power Combiner board.

Operation with one power supply m odule is also supported, but there is no

redundancy.

The power supply modules contain the line ﬁlter, the 100-240 VAC to 12 V supply,

a fan, and the power module board, which adapts the cables to a board-to-board

h

eader. The power module board also has LEDs to drive the light pipe that shows

power status on the rear panel of the power supply module.

The power module board has an EEPROM to log hours of operation. Since

the power module board tracks the use time on the other supply components,

replacing components within the supply module is not allowed.

The Power Combiner board takes in the 12 V from the one or two supplies, and

converts to 5 V for the rest of the instrument. If there are two good supplies, the

embedded microcontroller in the combiner chooses the preferred one. If either

supply has an issue, the m icrocontroller chooses the best one. 12 V storage

capacitors allow time f or the system to switch supplies without any disruption o f

the 5 V output. During the boot up of the combiner microcontroller, the combiner

functions in diode mode and uses the supply with the higher voltage, or a mix of

the two.

SPG8000 Master Sync / Clock Reference Generator Service Manual 3

Theory of operation

The Power Combi

ner board also has the fan controllers, so the speed of all three

fans can be set and se nsed by the instrument processor over the I2C interface.

The network interface signals pass through the combiner but only connect to

the two connectors.

An I2C interface is used to allow the processor to access the micro-controller

on the power combiner, the fan speed control, and the EEPROMS in the power

supply modules.

Optional m

odules theory of operation

The instrument has a standard Genlock/Black generator board, plus orderable

option boards. The options are: GPS Receiver board, AG board, BG board, and

SDI board

. This section describes the functions associated with those boards.

Option AG

This section describes the basic operation of the major circuit blocks in the

Option A

G A udio Generator.

Bus interface. This block provides the communication between the Option AG

circuitry and the instrument Main board.

Audio memory. This block contains 20/24 bits audio data for all of the serial

audio

outputs.

Audio data controller. The block is a part of the FPGA. It receives a udio data

from the Audio Memory and encodes thesedatatoserialaudiodatastreamthat

comply with the AES/EBU standard.

Cha

nnel buffers (1+2, 3+4, 5+6, 7+8, and silence). These blocks receive the digital

audio data from the FPGA and set the output amplitude to the speciﬁed level.

Figure 2: Simpliﬁed block diagram of the Option AG

4 SPG8000 Master Sync / Clock Reference Generator Service Manual

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